Case Study On The Marine Physical Environmental Cumulative Impact Assessment About The Construction Of Sea Port

At present, the planning and construction of sea port in China develops greatly, and the sea port area contains of harbors and port-centered industries, so the research about the influence of planning and construction is important for natural environment and social economic environment. This paper reviews the development of environmental impact assessment and port planning at home and abroad, and introduces the planning principles of the deep shoreline resources, which is used to construct sea port, and shows the theoretical basis of planning environmental impact assessment about port planning and construction, and mainly studies the marine cumulative evaluation of port planning environmental impact assessment.This paper chooses marine physical envrionment as the research object, and introduces the research situation of numerical simulation about the tidal current field, suspended sediment, shoreline sediment scouring and thermal discharge, and studies the marine environmental problem which used above technology to assess the construction and planning of sea port, such as marine hydrological dynamic environment, marine water quality environment, sediment scouring environment. This paper plans to lay out the range of the thermal pollution mixed area, and calculates the thermal environmental capacity for the power plant's thermal discharge problem. The paper also studies the change of sediment scouring distribution and contribution rate in semi-closed port basin when power plant gets water from it.This paper uses the theories, evaluation indexes and evaluation methods of marine planning environmental impact assessment to the construction and planning of north port area in Lanshan district of Rizhao city, and researches the marine physical environment cumulative impacts under the circumstance of kinds projects. The evaluation results show that:①the large range of sea reclamation in port area doesn't change the movement tendency of tidal current field in this sea area, however, the flow velocity in nearshore becomes decreased significantly;②the influence range of suspended sediment produced from construction is larger, which will cause damage for the nearby culture area;③the diffusion range of thermal discharge distributes between the two planning piers; the temperature rise will not influence the cooling function in water intake, we know the thermal environmental capacity in this sea area still has margin after calculation;④this planning has a little influence on sediment scouring, it doesn't change the present scouring situation in old port area;⑤the water intake of power plant has a definite influence on sediment scouring in semi-closed port basin, the distribution of scouring changes along with the distance from water intake point. On the aspect of social economic, the north port planning will have a great promotion for the development of steel industry in Shandong province and the economy in Rizhao city. At last, the comprehensive managemental mechanism and proposal of environment after planning are advanced, in order to make balanced between economical development and environmental protection.Through the research of this paper, the theories, evaluation indexes and evaluation methods of marine planning environmental impact assessment are further studied and utilized, it is helpful to improve the marine environmental management on the aspect of planning and construction about the sea port.